Rotary blower



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No. 533,291. Patented Jan. 29, 1895.

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Attol ney Witnesses:

(No Model.) 2 Sheets-Sheet 2.

T. W. GREEN.

ROTARY BLOWER.

No. 533,291. Patented Jan. 29, 1895.

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UNHED STATES PATENT @rrrcn.

ROTARY B LOWER.

SPECIFICATION formingpart of Letters Patent No. 533,291, dated January29, 1895.

Application filed June 1 1894- .Zo aZZ whom it may concern:

Be it known that I, THOMAS W. GREEN, a citizen of the United States,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inRotary Blowers; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, which form a part of this specification.

My invention relates to rotary blowers or exhausters for forcing orexhausting air, water and other fluids and the improvement consists inthe particular construction and arrangements of the parts of therevolvers that are located between the blades or wings and form thelooks or cut offs to prevent the escape and backward flow of the fluidacted upon.

In the patent granted to me on February 20, 1894:, and numbered 515,212,the general construction and operation of this class of blowers orexhausters were particularly described.

My present invention difiers from the blower described in my formerapplication only in the construction and arrangement of those parts ofthe revolvers that form the cut oif mechanism.

In the accompanying drawings Figure 1, is a vertical cross sectionthrough a blower having my improvements therein. Fig. 2, is a plan viewof the machine shown in Fig. 1, with the upper half of the outsidecasing removed therefrom. Fig. 3, is a vertical cross section of theblower shown in Fig. 1, with the blades and cut offs in a differentposition.

A, is a bed plate of the machine.

B, is the end castings forming the support for the driving shafts; C,the external casing surrounding the revolvers.

A, is the intake for the air or water; B, the outlet or discharge port;D, D, the driving shafts; E and E, the two revolvers secured upon theirrespective shafts D, D.

E and E are solid heads on each of the revolvers and are, preferably,made integral therewith.

Serial No. 513,136. (in model.)

a, a, are wings or blades on the revolvers E and E. These blades may bemade in a separate piece and bolted to the revolvers or they may be castintegral therewith as shown in the drawings.

19, b, b, h, are four short segmental extensions formedon the revolverE, from each other.

b, h, b, b, are similar short segmental extensions formed on therevolver E. The outer surfaces of these segmental extensions 19 and b,are segments of circles, the center of which is the center of therespective driving shafts, the diameter of said circles being equal tothe distance between the centers of the driving shafts D, D.

c, c, o, c, are four larger segmental extensions formed on the revolverE. The outer surfaces of these segmental extensions 0, are segments of acircle the radius of which is the distance in a straight line fromapproximately the middle part of one of the blades a, to the nearestpoint of one of the short extensions b', the measurement being takenfrom a point at the base of the blade at, where the circle forming theextension I), would touch the said blade. The center of these circleswould be on the circumference of the circle forming the extensions 6,midway between the two blades a, a.

c, o, c, c, are four other segmental extensions formed on the revolverE. These segmental extensions are the same size as the extensions o, a,but are formed upon circles having their centers on the circumference ofthe circle forming the short extensions 1), at or near the base of theblades a, a, and on a line drawn through the middle of said blades.

When the extensions 1) and b, and c and c, are formed to circles ofcorrect diameters the forward end of the short extensions 19, b, on therevolver E, will engage with the outer surface of one of the longextensions 0 or c, following it around until the two short exten sions band b, meet. WVhen these two short extensions begin to separate as therevolvers turn around, the rear end of the short extension 1), willengage with the outer surface of the long extension 0 or 0, immediatelyfollowing, on the revolver E, thus maintaining a complete cut off untilthe other similar parts of the two revolvers co-operate for the sameequidistant purpose and by this means prevent the backward flow of thefluid.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent of the United States, is

1. In a rotary blower or exhauster the revolver E, having the flatblades or wings a, and between thesaid wings or blades the shortsegmental extensions 1), in combination with the revolver E, having theflat blades or wings a, and between the said wings or blades the shortsegmental extensions b, and the long segmental extensions 0 and c, theends of the short segmental sections 1), on the revolver E, beingadapted to engage with the outer surfaces of the long extensions 0 andc, on the revolver E, both of the said revolvers being mounted in asuitable frame and working together substantially as and for the pur'pose described.

2. In a rotary blower or exhauster having an outer casing provided withsuitable intake and discharge openings, the combination of the revolverE, having a head E integral therewith, and provided'with blades or wingsa, and between the said blades or wings the short segmental extensions1), with the revolver E, having a head E integral therewith, "andprovided with the blades or wings a, and between the said blades orwings the short segmental extensions b, and the long segmentalextensions 0 and 0' located at the ends of the extensions b, theextensions 0 converging toward the blades or wings a, and the extensions0 extending in an opposite direction, the extensions of one revolverbeing adapted to engage with the extensions of the other to form a lockor cut-off, as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

- THOMAS W. GREEN.

Witnesses:

SAML. H. KIRKPATRICK, THOMAS D. MOWLDS.

